Corrosion process of bismuth-based superconductor cuprates in a moisture atmosphere

✍ Scribed by O. Monnereau; Z.C. Kang; E. Russ; I. Suliga; G. Vacquier; T. Badéche; C. Boulesteix; A. Casalot

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 829 KB
• Volume: 3
• Category: Article
• ISSN: 0964-1807
• DOI: 10.1016/0964-1807(95)00055-a

✦ Synopsis

Sintered pellets and single crystals of Bi2Sr2CaCuZ0s ( 2212) and Bi2Sr$u06 ( 2201) have been exposed to moistened air or just to water vapour. The following alterations observed have been studied by SEM, microanalysis, optical microscopic techniques, and FTIR. A possible reaction path for the alteration process is proposed.

By means, of optical and SEM observations, several morphologies of the alteration products have been observed. tie main steps. responsible for the degradation, have been found: the leaching of Sr and Ca cations from the matrix by fixed water, then a carbonate and hydroxide precipitation. In both cases, Ca and Sr extraction leads to Bi2Cu04.